diff --git a/db/migrate/20181101191341_create_clusters_applications_cert_manager.rb b/db/migrate/20181101191341_create_clusters_applications_cert_manager.rb
index 40767a18592c291bd718e59a96e09ac10822bd9e..4966b89964a61d24b71d198200737f3994ad6b1f 100644
--- a/db/migrate/20181101191341_create_clusters_applications_cert_manager.rb
+++ b/db/migrate/20181101191341_create_clusters_applications_cert_manager.rb
@@ -7,7 +7,7 @@ class CreateClustersApplicationsCertManager < ActiveRecord::Migration
 
   def change
     create_table :clusters_applications_cert_managers do |t|
-      t.references :cluster, null: false, unique: true, index: false, foreign_key: { on_delete: :cascade }
+      t.references :cluster, null: false, index: false, foreign_key: { on_delete: :cascade }
       t.integer :status, null: false
       t.string :version, null: false
       t.string :email, null: false